FC Fiber optic attenuator (fixed) looks like a FC optic fiber adaptor. This only difference between themis: FC fiber optic attenuator has a attenuation slice in the inner, but FC adaptor have not. The main feature of optic attenuator is that simple structure and easy to install. Now FC fiber optic attenuator is broadly used the Fiber Communication Systems，CATV and the measuring of High-power optic devices.